During Upgrade from R/3 4.6c to ECC6.0 EHP4, we stuck up with this error in the phase '5.Preprocessing'

******* LIST OF ERRORS AND RETURN CODES ******* ************************************************** ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SHADOW IMPORT ERRORS and RETURN CODE in SAPKLDESR1EHP4ERP6X0.DV1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2EETW169 no connect possible: "connect failed with DBLI_RC_LOAD_LIB_FAILED." Long text: Cause R3trans cannot logon to the database. System Response The program is cancelled. What to do In the R3trans log you will find an SQL error number, which gives you the cause of the error. Environment variables not set (or incorrectly set) are the most frequent reason for the error (TWO_TASK or ORACLE_SID/ORACLE_HOME). 1 ETP111 exit code : "12" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SHADOW IMPORT ERRORS and RETURN CODE in SAPKLDESR1EHP4ERP6X1.DV1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2EETW169 no connect possible: "connect failed with DBLI_RC_LOAD_LIB_FAILED." Long text: see above 1 ETP111 exit code : "12"

Your R3trans output from I:\usr\sap\DV1\upg\abap\exenew, indicates either couldn't locate the correct dboraslib.dll or even if dboraslib.dll exists in correct path, it could have incompatibility issue.